fix: typo in introduction (#800)

Co-authored-by: Thomas Frauenstein <[email protected]>

chapters/introduction.adoc

@@ -4,7 +4,7 @@
 Zalando’s software architecture centers around decoupled microservices
 that provide functionality via RESTful APIs with a JSON payload. Small
 engineering teams own, deploy and operate these microservices in their
-AWS (team) accounts. Our APIs most purely express what our systems do,
+AWS (team) accounts. Our APIs express most purely what our systems do,
 and are therefore highly valuable business assets. Designing
 high-quality, long-lasting APIs has become even more critical for us
 since we started developing our new open platform strategy, which